package com.xyz.springcloud.controller;

import com.xyz.springcloud.entity.CommonResult;
import com.xyz.springcloud.entity.Payment;
import com.xyz.springcloud.lb.LoadBalancer;
import lombok.extern.slf4j.Slf4j;
import org.springframework.cloud.client.ServiceInstance;
import org.springframework.cloud.client.discovery.DiscoveryClient;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.*;
import org.springframework.web.client.RestTemplate;

import javax.annotation.Resource;
import java.net.URI;
import java.util.List;

/**
 * @author 肖咉卓
 */
@RestController
@Slf4j
public class OrderController {

    /**
     *  //private static final String PAYMENT_URL = "http://localhost:8001";
     */
    private static final String PAYMENT_URL = "http://CLOUD-PAYMENT-SERVICE";

    @Resource
    private RestTemplate restTemplate;

    /**
     * 引入我们自己手写的负载均衡类
     */
    @Resource
    private LoadBalancer loadBalancer;
    @Resource
    private DiscoveryClient discoveryClient;

    @GetMapping("/consumer/payment/add")
    public CommonResult<Payment> create(Payment payment){
        //调用远程方法返回值，路径、传过去值、返回值
        System.out.println(payment.getSerial());
        return restTemplate.postForObject(PAYMENT_URL+"/payment/add",payment,CommonResult.class);
    }

    @GetMapping("/consumer/payment/get/{id}")
    public CommonResult<Payment> getPayment(@PathVariable("id")Long id){
        //调用远程git方法返回值,值为路径，返回值
        return restTemplate.getForObject(PAYMENT_URL+"/payment/get/"+id,CommonResult.class);
    }

    @GetMapping("/consumer/payment/getForEntity/{id}")
    public CommonResult<Payment> getPayment2(@PathVariable("id")Long id){
        //ResponseEntity 包含了响应的状态码和响应的内容 获得更加详细的信息
        ResponseEntity<CommonResult> entity = restTemplate.getForEntity(PAYMENT_URL+"/payment/get/"+id,CommonResult.class);
        //判断是否为 2xx(200) 成功就返回值
        if (entity.getStatusCode().is2xxSuccessful()){
            return entity.getBody();
        }else {
            return new CommonResult<>(444,"操作失败");
        }
    }

    @GetMapping("/consumer/payment/lb")
    public String getPaymentLB(){
        List<ServiceInstance> instances = discoveryClient.getInstances("CLOUD-PAYMENT-SERVICE");
        if(instances == null || instances.size()<=0){
            return null;
        }
        ServiceInstance serviceInstance = loadBalancer.instances(instances);
        URI uri = serviceInstance.getUri();
        return restTemplate.getForObject(uri+"/payment/lb",String.class);
    }

    // ====================> zipkin+sleuth
    @GetMapping("/consumer/payment/zipkin")
    public String paymentZipkin()
    {
        String result = restTemplate.getForObject(PAYMENT_URL+"/payment/zipkin/", String.class);
        return result;
    }

}
